1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1980, 1992, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33
34__FBSDID("$FreeBSD$");
35
36#ifdef lint
37static const char sccsid[] = "@(#)cmds.c	8.2 (Berkeley) 4/29/95";
38#endif
39
40#include <sys/param.h>
41
42#include <ctype.h>
43#include <signal.h>
44#include <stdlib.h>
45#include <string.h>
46#include <unistd.h>
47
48#include "systat.h"
49#include "extern.h"
50
51void
52command(const char *cmd)
53{
54	struct cmdtab *p;
55	char *cp, *tmpstr, *tmpstr1;
56	double t;
57
58	tmpstr = tmpstr1 = strdup(cmd);
59	for (cp = tmpstr1; *cp && !isspace(*cp); cp++)
60		;
61	if (*cp)
62		*cp++ = '\0';
63	if (*tmpstr1 == '\0')
64		goto done;
65	for (; *cp && isspace(*cp); cp++)
66		;
67	if (strcmp(tmpstr1, "quit") == 0 || strcmp(tmpstr1, "q") == 0)
68		die(0);
69	if (strcmp(tmpstr1, "load") == 0) {
70		load();
71		goto done;
72	}
73	if (strcmp(tmpstr1, "stop") == 0) {
74		delay = 0;
75		mvaddstr(CMDLINE, 0, "Refresh disabled.");
76		clrtoeol();
77		goto done;
78	}
79	if (strcmp(tmpstr1, "help") == 0) {
80		int _col, _len;
81
82		move(CMDLINE, _col = 0);
83		for (p = cmdtab; p->c_name; p++) {
84			_len = strlen(p->c_name);
85			if (_col + _len > COLS)
86				break;
87			addstr(p->c_name); _col += _len;
88			if (_col + 1 < COLS)
89				addch(' ');
90		}
91		clrtoeol();
92		goto done;
93	}
94	t = strtod(tmpstr1, NULL) * 1000000.0;
95	if (t > 0 && t < (double)UINT_MAX)
96		delay = (unsigned int)t;
97	if ((t <= 0 || t > (double)UINT_MAX) &&
98	    (strcmp(tmpstr1, "start") == 0 ||
99	    strcmp(tmpstr1, "interval") == 0)) {
100		if (*cp != '\0') {
101			t = strtod(cp, NULL) * 1000000.0;
102			if (t <= 0 || t >= (double)UINT_MAX) {
103				error("%d: bad interval.", (int)t);
104				goto done;
105			}
106		}
107	}
108	if (t > 0) {
109		delay = (unsigned int)t;
110		display();
111		status();
112		goto done;
113	}
114	p = lookup(tmpstr1);
115	if (p == (struct cmdtab *)-1) {
116		error("%s: Ambiguous command.", tmpstr1);
117		goto done;
118	}
119	if (p) {
120		if (curcmd == p)
121			goto done;
122		(*curcmd->c_close)(wnd);
123		curcmd->c_flags &= ~CF_INIT;
124		wnd = (*p->c_open)();
125		if (wnd == NULL) {
126			error("Couldn't open new display");
127			wnd = (*curcmd->c_open)();
128			if (wnd == NULL) {
129				error("Couldn't change back to previous cmd");
130				exit(1);
131			}
132			p = curcmd;
133		}
134		if ((p->c_flags & CF_INIT) == 0) {
135			if ((*p->c_init)())
136				p->c_flags |= CF_INIT;
137			else
138				goto done;
139		}
140		curcmd = p;
141		labels();
142		display();
143		status();
144		goto done;
145	}
146	if (curcmd->c_cmd == NULL || !(*curcmd->c_cmd)(tmpstr1, cp))
147		error("%s: Unknown command.", tmpstr1);
148done:
149	free(tmpstr);
150}
151
152struct cmdtab *
153lookup(const char *name)
154{
155	const char *p, *q;
156	struct cmdtab *ct, *found;
157	int nmatches, longest;
158
159	longest = 0;
160	nmatches = 0;
161	found = (struct cmdtab *) 0;
162	for (ct = cmdtab; (p = ct->c_name); ct++) {
163		for (q = name; *q == *p++; q++)
164			if (*q == 0)		/* exact match? */
165				return (ct);
166		if (!*q) {			/* the name was a prefix */
167			if (q - name > longest) {
168				longest = q - name;
169				nmatches = 1;
170				found = ct;
171			} else if (q - name == longest)
172				nmatches++;
173		}
174	}
175	if (nmatches > 1)
176		return ((struct cmdtab *)-1);
177	return (found);
178}
179
180void
181status(void)
182{
183
184	error("Showing %s, refresh every %d seconds.",
185	  curcmd->c_name, delay / 1000000);
186}
187
188int
189prefix(const char *s1, const char *s2)
190{
191
192	while (*s1 == *s2) {
193		if (*s1 == '\0')
194			return (1);
195		s1++, s2++;
196	}
197	return (*s1 == '\0');
198}
199